Hacksaw.



' PATENTED FEB. 19, 1907.

E. WENTWORTH.

HAGKSAW.

APPLICATION FILED APR. 24 1906.

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EPHRAIM WENTWORTI-I, or BERLIN MILLS, NEW HAMPSHIRE.

HACKSAW.

Specification of Letters Patent.

Patented Feb. 19, 1907.

Application filed April 24,1906. Serial No. 313.417.

T0- ctZl whom it may concern:

Be it known that I, EPHRAIM WENTWORTI-I, a citizen of the United States, residing at Berlin Mills, in the county of Coos and State of New Hampshire, have invented new and useful Improvements in I'Iacksaws, of which the following is a specification.

This invention relates to hacksaws, being especially directed to the frame for holding the saw-blade, and has for its objects to produce a comparatively simple inexpensive device of this character which may be readily adjusted for blades of varying lengths, one whereby the blade may be conveniently set at various angles, and one in which a proper tension may be applied to the blade.

Afurther object of the invention is to provide a device of this character in which the blade may be readily mounted in the frame and one in which there will be no loose parts to become accidentally disconnected when the blade is removed from the frame.

l/Vith these and other objects in view the invention comprises the novel features of construction and combination of parts more fully hereinafter described.

In the accompanying drawings, Figure 1 is a side elevation, partly in section, of the saw embodying the invention. Fig. 2 is a detail front end view of the saw. Fig. 3 is a detail sectional View taken on the line 3 3 of Fig. 1. Fig. 4 is a detail view of the adjusting-screw. Fig. 5 is a similar view of the forward bear ing-block.

Referring to the drawings it will be seen that the saw-frame comprises a substantially U-shaped member presenting a back portion or bar 1 and end portions or bars 2 3, of which the latter is provided at its outer or lower end with a rectangular opening or recess 4 and witha rearwardly-projecting tubular lug 5, onto which there is threaded one end of a tubular handle 6, having a central longitudinal bore 7 in line with the opening through the projection 5 for the accommodation of a longitudinally-adjustable tensioning element or screw 8, on which is threaded an adjusting member or nut 9, arranged in the recess 4, there being also threaded onto the screw 8, which is provided at its forward end with a seat or recess 10 and adjacent its forward end with a pair of oppositely-disposed projecting engaging portions or pins 11, a set-nut 12 for a purpose which will hereinafter appear.

J ournaled for rotation in a suitable hearing opening 13, provided at the outer or lower end of frame-bar 2, is a cylindrical bearing member or block 14, disposed in endwise alinement with the screw 8, having at its inner end an undercut recess 15, presenting an inclined bearing-wall 16 and containing a fixed engaging pin or stud 17, there being provided on the block 14, respectively at opposite sides of the bar 2, two pairs of opposed transversely-projecting engaging por tions or pins 18 19, of which the former are adapted to seat in diametrically opposed grooves or recesses 20 21, formed in the outer face of the bar 2 for a purpose which will hereinafter appear, while slidably disposed upon the back bar 1 is an adjustable bearing member or arm 22, arranged parallel with the end portions 2 and 3 and having at its outer or lower end a bearing-opening 23 for rotatively receiving the screw 8 and also having formed in its front face two sets of diametrically opposed. grooves or recesses 24 25, in which the pins 11 are adapted to seat.

Detachably secured in the frame is a blade 26, provided at its forward end with an opening 27 to receive the engaging stud 17 and at its rear end in a corresponding opening for the reception of a fastening member or screw 28 in threaded engagement with the forward end of screw 8 and within the recess 10. In practice the forward end of the blade is connected with the bearing member 14 by inserting the pin 17 through the opening 27 and seating the terminal of the blade beneath the undercut or inclined wall 16, the rear end of the blade being thereafter detachably engaged with the forward end of screw 8 by means of the fastening-screw 28. After connecting the blade in the manner explained the same is adjusted at the desired angle by turning the members 8 and 14 until the pins 11 and 18 are properly seated in the appropriate recesses, after which the blade is tensioned by turning the nut 9 in a direction for feeding the screw 8 rearwardly into the bore 7, it being understood that in adjusting the blade to the desired angle the pins 11 will be seated in one or the other of the pairs of re cesses 24 25, while the pins 18 will be positioned in the corresponding recesses 20 or 21, thus to fix the blade against accidental rotation after it has been placed under tension through the medium of the tensioning-screw 8. After the blade has been connected and the pins 11 seated in the appropriate recesses in the front face of arm 22, the latter is fixed for movement with the screw 8 by setting up the nut 12 againstthe rear face of the arm, as seen in Fig. 1. It is to be particu larly observed that the frame is adapted for use with blades of varying lengths and that the blades may be conveniently interchanged as desired and will be properly braced at their rear ends while in use by means of the bracing member or arm 22.

Having thus described my invention, what I claim is 1. In a saw, a frame member comprising a back and end portions, a bracing member slidably engaged with said back portion, an adjusting-screw engaged with one of the end portions and extended through said bracing member, and a blade operatively connected at its ends with the screw and with the end portion of the frame most remote fromsaid screw.

2. In a saw, a frame member comprising a back and end portions, a'bracing-arm slidably disposed upon said back portion, bearing-openings provided in the arm and adjacent end portion of the frame member, a tensioning-screw rotatively mounted in said bearing-openings, a bearing-head rotatively engaged with the forward end portion, a blade terminally engaged with the bearing member and screw, and means for operating the latter to tension the blade.

In testimony whereof I affix my signature in presence of two witnesses.

EPI-IRAIM WENTWORTH.

I/Vitnesses:

MAMIE SHERIDAN, EMILE I-I. TARDIVEL 

